Pioneer repair results
Message #1 Posted by Mike H on 23 June 2004, 3:25 p.m.
Pioneer Repair
At the request of an associate, I am posting a repair project that I did.
I purchased an HP 27S calculator eBay that appeared to have been stepped on. The previous owner tried to pry it open (screwdriver on the side ~ caveman method). The faceplate was bent up, and the 0 and 1 keys were soft.
I removed the faceplate by warming it first with a hair drier to soften the adhesive. Then starting at the already bent corner, I carefully and slowly pulled it up and completely off. I removed the adhesive by letting the faceplate soak in Windex overnight. The next day I was able wipe off the adhesive with a paper towel. I straightened out the bent aluminium with a marble rolling pin. There is a bevel in the faceplate below the plastic lens that I carefully avoided. I opened the case by removing the four top heat stakes and pulled it apart following the guidance suggest in this forum. I then removed the top PCB, but not the one over the keys. There were no cracks on the keyboard, so I soaked it in warm distilled water and worked the keys. Let the unit air dry for a day and re-assembled the unit. Using contact cement, I secured the two halves together and applied the faceplate back on. To secure the faceplate while the glue set, I used some soft foam laid on top of the keys and a book on top of the foam. The foam kept pressure on the faceplate while the glue set.
All keys were responsive and functional but 0 and 1 still were soft. The unit passes the internal self-test and keyboard test. Overall I would still say it was in fair cosmetic condition; however, it was functional and tight and it looks a lot better that it did.
Mike H 1111
Edited: 23 June 2004, 5:18 p.m.
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